Combined typewriting and comput



May 2, 1939. H L. PlTMAN COMBINED TYPEWRITING AND COMPUTING MACHINE Fi'led Jan. 28, 1953 3 Sheets-Sheet l ATT NEY.

y 1939- H. L. PITMAN 2,156,481

COMBINED TYPEWRITING AND COMPUTING MACHINE Filed Jan. 28, 1935 3 Sheets-Sheet 2 May 2, 1939. H. L. PITMAN COMBINED TYPEWRITING AND COMPUTING MACHINE Filed Jan. 28, 1933 3 Sheets-Sheet 3 Patented May 2, 1939 UNITED STATES PATENTOFFICE comm Henry L. Pitman,

meme

Delaware cm com'u'n mo momma Westfleld, N, 1., assignor, by ts, to Underwood Elliott Fisher Company, New York, N. Y., a

Application January 28, 1933, Serial No. 654,057

8 Claims.

The organizations shown in said applications are 4 for computing in the decimal-system.

The present application discloses an organization in which the direct subtraction-features and 20 carry-over-features shown in said applications are embodied in novel combination with other devices by means of which it is contrived to compute additively and subtractively according to the English monetary system.

In the Underwood bookkeeping machine, the typewriter surmounts the computing mechanism. The numeral-type keys when operated to print also set index-pins in reciprocatory rack-bars. After the printing of an item in the computing 30 zone of a work-sheet accompanied by setting of corresponding index-pins in the several rack or pin bars, said pin-bars are reciprocated to rotate the computing pinions. The pin-setting is accomplished by means of pin-setting linkages operable by the numeral-keys and including depressible bars extending transversely of the pinbars. The bars carrying the index-pins are normally in such position that a pin-setting bar would pass idly between the transverse rows of 40 index-pins. Denomination-selecting trains extend from the pin-bars to the typewriter-carriage whereby the latter as it moves step by step in a computing zone may slightly advance one pin-bar after the other to bring its pins under the pinsetting bars.

As set forth in said application No. 324,353, the pin-bar racks have permanently in mesh therewith a set of idlersforming with said racks a corner within which the computing pinions, 5 normally out of mesh from both the racks and idlers, stand. The computing pinions are mounted in a shiftable frame whereby they may be moved downwardly to mesh with the racks or rearwardly 'to mesh with the idlers When the 55 pinions are directly meshed with the racks, they are, by advancing the racks, rotated in one direction as for addition and when they are meshed with, the idlers they are rotated reversely as for subtraction.

For computing in the English monetary system the number of steps in a full revolution of some of the computing pinions has a decimal-base. while the number of steps for other pinions has a duodecimal-base.

For example, in the machine herein shown, the computing pinions representing pounds and shillings because the exchange or lings to pounds is twenty ten, pounds alone being have, say, ten teeth, transfer value of shil= which is a multiple of expressed in the decimalsystem. The exchange value of pence to shillings being twelve, the pence twelve teeth. With tional pence, namely,

three-fourths pence,

computing wheel regard to farthings or free one-fourth, one-half or the exchange value to pence is four, and a twelve-tooth pinion is therefore used for fractional pence or farthings, it being understood that a full revolution of the farthingswheel represents three exchange or transfer cycles,

each cycle including four steps.

With the computing pinions normally standing within the corner formed by the racks and idlers.

it is contrived to arrange the mounting means for the racks, pinions and idlers and the proportions of the racks and idlers so that the computing pinions may be shifted in the required two directions, substantially perpendicular to one another,

irrespective of the difierence in the numbers of teeth of the several pinions, and of the maintenance of uniformity in the unit-steps for all the racks.

The computing pinions are mounted on a common arbor so that the attached dial-wheels are presented uniformly at the sight-openings. For uniformity of the dial-wheel figures presented at the sight-opening, there is one dial-wheel representing tens of pence and another dial-wheel representing units of pence, one computing pinion.

from zero to nine pence and in wheel indicates the two being coupled to The units of pence dialcombination with the tens of pence dial-wheel also indicates ten and eleven pence, the tens-wheel being inscribed with two successive "1 figures in line with a 0 and a the 9 figure of the conformity with the of the ten and twelve 1 figure which follow units of pence wheel. In difference in pitch diameters tooth computing pinions,

the pitch lines of their respective racks are offset from one another. tooth pinions have have the idlers for The idlers for the twelvea less number of teeth than theten-tooth pinions, and

means are provided whereby their center of rotation is offset from the center of the idlers for the ten-tooth pinions. The composite arrangement is such that the.computing pinions will mesh properly either with the racks or idlers irrespective of the numbers of teeth they have.

Cycling mechanism for running an amount, set up in the pin-bars, into the computing wheels includes a reciprocatory bar extending crosswise of and below the rack-bars. The cross-bar is mounted for crosswise reciprocatory movement, so that, in its advance stroke, it encounters the depressed index-pins and thereby advances the racks to rotate the pinions. In accordance with certain functions of the Underwood computing mechanism, the cross-bar starts its advance as soon as the cycling operation is initiated. To afford time for meshing the computing pinions with their racks or idlers, there is an idle period at the beginning of the cross-bar advance before it encounters any depressed digit pin, said idle period enduring at least until the moment when said cross-bar would encounter a pin 01' the highest digit value.

The arrangement of the cycling mechanism as established in the Underwood bookkeeping machine is such that the cross-bar has a stroke after said idle period just long enough-to advance the rack-bars nine unit-spaces. With the necessity arising of advancing the pence-rackbar eleven spaces, it is contrived to provide means auxiliary to said cross-bar which will not only advance the pence-bar eleven spaces, but will also afford the above-mentioned idle period, before the pence-bar is picked up, during which the computing pinions are moved into mesh.

4 The means auxiliary to the cross-bar for advancing the pence-bar eleven unit-spaces, or, in other words, two unit-spaces in addition to the pence-bar advance effected by the cross-bar, include a lever pivoted to said cross-bar, the lever having a downwardly-extending arm and also having an upwardly-extending arm, to which may be connected an auxiliary member mounted for movement with the cross-bar, said member having a lateral projection for engaging the set index-pins of the pence-bar. Preferably, said member is generally similar to the rack-bars, that is, it is, like the rack-bars, straightly elongate and is formed to slide in the same combuides as the rack-bars. As the cross-bar nears the end of its advance stroke, the downwardlyextending arm of the lever encounters an interponent, which, as will be explained later, may

form part of the carry-over mechanism. As the cross-bar completes its advance stroke after said downwardly-extending arm of the lever is arrested by the interponent, the lever will be rocked, thereby causing the auxiliary member, connected thereto, to advance ahead of the crossbar, to an extent equivalent to the aforesaid two extra unit-spaces of pence-bar movement.

The lateral pin-engaging projection of said member stands somewhat behind the eleven-pin of the pence-bar, but, for reasons of structural arrangement, it does not standbehind far enough to afford an idle period of cross-bar movement sufficient for giving time for meshing the computing pinions. At the beginning of the crossbar advance, the aforesaid lever is therefore permitted to rotate idly to an extent limited by its stopping against the cross-bar. After the lever is so stopped, further advance of the cross-bar carries the auxiliary member along. Inasmuch as the lateral projection of said member Stands behind the eleven pence-pin, the advance move- I ment of said auxiliary member is at first idle, ,until said eleven pence-pin is encountered. The total idle period, therefore, of the cross-bar movement in respect to the pence-bar is made up of the time during which the lever rotates idly and the time thereafter in which the auxiliary member moves until it picks up theelevenpin. The parts may be so proportioned and arranged that said total idle period before the duodecimal pence-bar is advanced is no less than a similar period for a decimal-bar, assuming all the while that the former has the eleven-pin set and the latter hasthe nine-pin set. It will be understood that if pins of lower digit value are set, the idle period will be correspondingly increased. It is only the minimum idle period, which obtains when the highest digit value pins are set, that is to be considered, because said minimum idle period must afford suflicient time for the meshing of the computing pinions.

As set forth in my aforesaid co-pending applications, carry-over from one dial-wheel to the dial-wheel of next higher denominationis e1- fected by causing the pin bar or rack for said latter wheel to be advanced an extra step. To this end, the cross-bar of the general operator has a series of rack-advancing fingers formed at the end of upstanding arms of levers. There is one of said levers for each rack-bar, and the levers are pivoted to the cross-bar, so that said fingers normally abut what was formerly the pin-engaging face of the cross-bar. With the fingers so abutting said cross-bar face, it will be seen that they engage the pins in the advance of the cross-bar, and that at the end of the cross-bar advance, the rocking of a lever will cause its pin-engaging finger to advance ahead of the cross-bar, and thereby advance the pinbar beyond the advance of said pin-bar effected by the cross-bar itself. Each of the fingerforming levers has also a downwardly-extending arm. Opposed to each finger-lever on the crossbar, at the end of the cross-bar advance, is another lever having a stationary fulcrum, from which extends upwardly an arm carrying a stop which is opposite the cross-bar lever-finger. The stationary lever also has a downwardly-extending arm forming an interponent against which the downwardly-extending arm of the cross-bar lever abuts at theend of the cross-bar advance. There is one stationary lever for every fingerforming lever on the cross-bar. Each stationary lever is normally latched in such position that at the end of the cross-bar advance, the depressed pin engaged by the cross-bar finger just abuts the aforesaid stop carried by the stationary lever, said finger still abutting the face of the cross-bar. With the downwardlyextending arms of the stationary lever and crossbar lever in abutment with one another, rocking of the stationary lever will cause a corresponding rocking of the cross-bar lever, resulting in an extra advance of the pin-bar to the extent of' one carrying step. Rocking of the stationary lever is effected by a spring when latching means which hold said lever in normal position against the pull of said spring are tripped. A train, in

which are included latching means for the stationary lever and means for tripping the latching means, extends from each wheel to the stationary lever related to the pin-bar for the dialwheel of next higher denomination, each dialwheel having one or more carry-over teeth for tripping the latching means. The number of carry-over teeth depends on the number of transfer cycles occurring in a full revolution of the dial-wheel. Thus the tens of shillings wheel has flve carry -over teeth, because every second step of said wheel must effect a carrying step or transfer of one to the units-pounds dial-wheel. similarly, the fractional pence or farthing wheel, a full revolution of which encompasses three transfer cycles, has three carry-over teeth. All of the other wheels have only one carry-over tooth except the tens of pence wheel, which has no carry-over tooth at all, because it is coupled to the units pence wheel, the latter having one carry-over tooth.

As already stated, the pence-rack bar is moved two unitsteps in addition to the movement it receives from the advance oi the cross-bar, the additional movement being effected by means of the aforesaid extra advance lever carried bythe crossbar and connected to the auxiliary member that engages the pence-bar.

A feature of the novel organization resides in the utilization of said latter lever also as a carryover lever forthe pence-rack bar, that is to say, it is contrived to make said latter lever and the auxiliary member connected thereto perform the same function as does the aforesaid lever on the cross-bar, associated with each of the other pinbars. The abutment, by means of which the extra advance lever on the cross-bar is rocked at the end of the cross-bar advance, may be the downwardly-extending arm of the aforesaid stationary carry-over lever which is provided for the pence-bar. If said stationary carry-over lever is rocked by tripping its latching means, through one of the carry-over teeth of the farthingswheel, it will be seen that the extra advance lever is also rocked to an extent which is additional to the rocking movement imparted to it for moving the pence-bar its additional two steps, said additional extent being equivalent to an extra carrying advance of one unit-space of the auxiliary member and hence of the pence-bar.

The numeral-key bank of the typewriter is provided with twelve numeral-keys, from to 11", inclusive. The Underwood pin-setting frame is provided with two extra sets of parallel motion pin-setting linkages and two extra rockshafts for operating said extra linkages. Said two extra rock-shafts may be operated in the usual way by the 10 and 11 numeral-keys. The arrangement of the pin-setting frame embodying the twelve pin-setting linkages and of the numeral-keys may generally be as set forth in the patent to Hanson, No. 1,279,688, dated September 24, 1918, the frame of the present organization being, however, much more simple, inasmuch as it does not need to be arranged for complementary subtraction.

Other features and advantages will hereinafter appear.

In'the accompanying drawings,

Figure 1 is a perspective view, showing details of means for mounting ,and offsetting the arbors of the idlers for the ten and twelve tooth computing pinions.

Figure 2 is a perspective view, showing the arrangement of the dial-wheels, rack-bars, idlers and pin-setting devices, and also showing the arrangement of the general operator and associated means for advancing the rack-bars.

Figure 3 is a view showing details of the means for supporting one side of the shiftable dialwheel frame. Y

Figure 4 is a view showing, inperspective, the

dial-wheels for pounds, shillings and pence, and

indicating the number of carrying teeth on each of said wheels and the inscription of the requisite dial-numbers thereon.

Figure 5 is a side view, showing the train including the decimal-pin bar, computing pinion, idler and carry-over devices for computing decimally.

Figure 6 is a top plan seen in Figure 2.

Figure 7 is a side view, showing the pence-bar with its eleven-pin set, fully advanced by the general operator, and also advanced additionally by tripping of its carry-over train.

Figure 8 is a view indicating a numeral-key bank of twelve keys.

Figure 9 is a side view, showing the pencebar, the general operator and co-operating parts in normal position.

Figure 10 is a side view, showing the general operator advanced to the point where the associated auxiliary means are about to pick up the eleven-pin of the pence-bar.

Figure 11 is a side view, showing the general operator at the end of its advance stroke and showing how the lever for advancing the pencebar two extra spaces is rotated to so advance said pence-bar.

Numeral-type keys 20, mounted on key-levers 2|, are generally indicated by one of said keys and levers in Figure 2. Depending from each keylever 2| is a stem 22, whereby the key-lever when depressed rocks a shaft 23 as said stem engages a horizontal arm 24, fast to said shaft. Also fastened to said shaft is an upright arm 25, connected, as shown, to an upper link 26, forming part of a parallel motion linkage including also a lower link 21 depressible edgewise, the endwise movement of the upper link 23, caused by rocking the shaft 23, being translated into downward movement of the lower link 21 by means of bellcranks 28 connecting the pair of said links 26, 21 at their ends. The numeral-key bank of the typewriter may have twelve numeral-keys from 0" to "11, as indicated in Figure 8, and, for every one of said keys, there is a rock-shaft 23, having arms 24, 25, and there is also a pair of links 26, 21, connected by bell-cranks 28. All the several pairs of links 23, 21, each pair connected by bellcranks 23, and all the associated rock-shafts 23, for the twelve numeral-keys, are mounted in a suitable frame, not shown, but which may be constructed along the lines set forth in the aforesaid Hanson patent, No. 1,279,688, or in the patent to Gumprecht, No. 1,338,012, dated April 2'7, 1920.

Depression of any numeral-key will cause a corresponding link or pin-setting bar 21 to descend for setting a corresponding index-pin 29 of a series of such .pins carried by each one of elongate horizontal bars 30 or 3|. There are two of the bars 30, one being for pence and the other being for fractional pence or farthings. Of the six bars 3|, shown in Figures 2 and 6, two of them are for tens and units shillings and the other four are for pounds, it being understood that the number of bars 3|, allotted for pounds, may be varied. The bars 30, 3| extend fore and aft of the computing mechanism, which, it will be understood, by reference to my aforesaid applications, is surmounted by the typewriter. At its forward end, each of the bars 30 or 3| has formed thereon a rack 32. The several bars 30, 3| are mounted for reciprocatory movement in a rear comb-guide 33 and a front comb-guide 34.

view of the organization dial 38 and on the units-shillings dial 40 Each of the bars 30 has permanently in mesh therewith an idler 35. Similarly, the bars 3| have permanently in mesh therewith idlers 36.

Mounted to rotate freely on a common arbor 31 is a series of computing-wheel dials, there being four dials 38 for pounds, one dial 39 for tens-shillings, one dial 40 for units-shilling, one dial 4| for tens-pence, one dial 42 for units-pence and one dial 43 for fractional pence. The dials 4|, 42 for tens and units pence are coupled together as by an intermediate collar 44 which also serves to space them apart at the adopted dialwheel spacing. Considering the conversion factors of the several sterling money-denominations, it will be understood that the number of steps to a full revolution of the pounds and units-shillings dials 38, 39, 49 may be ten, and accordingly each of these dials has fastened thereto a ten-tooth computing pinion 45. Similarly, for reasons based on the conversion factors, a twelve-tooth pinion 46 is fastened to the coupled pence-dials 4|, 42, and also to the fractional-pence dial 43, because in either of these dials-a full revolution thereof encompasses twelve steps.

Encircling figures inscribed on each poundsrange from to 9. Inasmuch as the highest number of shillings ever indicated by the shillingsdials 39, 40 is nineteen, the tens-shillings dial 39 has a series of five 1 figures inscribed there- ,on at equal intervals apart, it being understood that every second step of the tens-shillings dial entails conversion or transfer of one to the unitspounds wheel. The units-pence wheel has twelve figures, namely, 0 to 9 in numerical sequence followed'by another 0 and another "1. The latter 0 and 1 represent ten pence and eleven pence respectively,.in conjunction with 1 figures on the tens-pence dial 4|. Arrangement of the dial-figures on the several dial-wiheels is shown in Figures 4 and 6. The figures on the fractional pence or farthings wheel 43 represent 0, and pence, it being the usual practice to so represent farthings. Since said latter dial-wheel 43 takes twelve steps for a full revolution, the range of figures from 0" to A is inscribed three times around said dial 43.

The computing pinions 45, 46 stand within the corner formed by the racks 32 and the idlers 35, 36, and are normally disengaged from both the racks and idlers. The pence-fraction bar 39 has four pins representing 0, A 4 pence.

The conversion factor of pence to a unit of,

shillings being twelve, the pence-bar 30 is indexable according to duodecimal digits and therefore has twelve digit-pins 29 ranging in value from zero to eleven, eleven being the highest digit value pin settable in the pence-bar. The highest digit value settable in any one of the pounds pin-bars 3|, or in the units-shillings pin-bar 3|, being nine, each of these pin-bars is provided with ten digit pins ranging in value from zero to nine. The tens-shillings pin-bar 3| has only two pins representing zero and one.

With the pin-bars 30, 3| in their fully retracted positions, see Figures 2 and 6, the pins 29 of the several bars 30, 3| form transversely-aligned rows, the row of zero-pins being foremost. With said bars in said retracted positions, any descending pin-setting bar 21 will pass idly between said rows. In the Underwood bookkeeping machine, advance of the pin-bars 30, 3|, to bring their pins under the pin-setting bars 21, is effected seriatim in denomination-selecting order under control of the typewriter-carriage (not shown) that is to say,

. train includes a lever 49 operated by if the-carriage is tabulated to a certain denomination in a computing zone, the pinbar of corresponding denomination will at the same time be advanced to bring its pins under the pin-setting bars 21. A numeral-key 20, then operated to print the first numeral in said zone, causes also the setting of the corresponding pin 29 in the slightly advanced Din-bar. Under control of the usual escapement-mechanism the car-,

riage then escapes to the next denominational column, causing the slightly advanced pin-bar to be retracted by the usual spring-device 48, and also causing the next bar 30 or 3| to be advanced to pin-setting position. Thus one bar after the other is advanced, as required, to pinsctting position asthe carriage, in accompaniment with operation of the numeral-type keys to print an item, moves step by step through a computing zone, and the pins 29 representing the numerals of said item are therefore depressed in the proper pin-bars 30 or 3|.

For advancing the pin-bars to pin-setting-position, there extends from the same to the carriage a series of pin-bar-advancing trains, one train for each pin-bar. Said trains may be of any suitable design, as, for example, the trains set forth in said Gumprecht Patent 1,338,012. Said trains are represented in Figure 9 by a fragmentary showing which is suflicient for illustrating the present invention. Each pin-bar-advancing a push-rod (not shown) when said rod is depressed by means of a carriage-tappet. Said lever 49, when operated, lifts a transposing linkage 50 to rock a bellcrank which, by engaging a projection 52 of the pin-bar, moves said pin-bar forwardly to pinsetting position. The system of linkages 50 is arranged to transpose the descending order of denominational selection, to-left movement of the carriage, into a left-toright order of pin-bar selection.

The depressed index-pins 29 form lugs projected into the path of a reciprocatory cross-bar 53 underlying the pin-bars 30, 3| and extending across the'machine, as indicated in'Figures 2 and 6. Means whereby said cross-bar 53 is mounted for reciprocatory movement include, on each side of the machine, a rack 54 guided for forth-and-back movement along the inner side of a side-member 55 of the framework, each rack 54 having a plate 56 to which an end of the crossbar 53 is joined. The racks 54 are constrained to move in unison by means which include a cross-shaft 5'! journaled in the side-members 55 and having fastened thereto, adjacent each of said sidemembers 55, a sector 58 geared to the underlying rack 54 by an intermediate pinion 59 mounted on the side-member 55. The racks 54, spanned by the cross-bar 53, and constrained to move in unison by the means just described, form a reciprocatory carriage or general operator, which may be driven by any suitable means, as, for example, a handle on an external portion of the cross-shaft 51, as shown in the aforesaid patent to Hanson, or by power-driven means, as set forth in the Hart patent, No. 1,212,895, dated January 16, 1917. Said power-driven means may include a reciprocatory driver 6| Figure 11, engaging one of the racks 54, said driver being connected to an electric motor by means of a key-controlled clutch-mechanism (not shown), whereby the 'general operator is given one forth-and-back movement constituting a cycle.

In conformity with the organization of the as instituted by the rightfinger 88 carry-over set forth in my aforesaid applications, there are provided adjacent to the cross-bar face which formerly engaged the set pins 28 pin-ensuing fingers 88, Figure 2, formed on the ends of upstanding arms 84 of levers 85. Exoepting the pence-bar 88, there is for each one of the ran-bars 88, 8| one of said levers 88, all of said levers being mounted to rotate individually on a common fulcrum-rod 88, supported in brackets 81, secured to the bottom of the crossbar 88. For the pence-bar 88, there is a device similar in certain respects to the lever 85, and this device will be explained further on.

Figure shows a register-train for computing decimally, that is, the illustrated pin-bar has only ten pins, and the computing pinion has ten teeth. It will be seen from Figure 5 that the cross-bar 58 will have at the beginning of its advance stroke an idle period, before the will pick up the nine-pin. This idle period affords time for shifting the computing pinions either downwardly into mesh with the racks 82 or rearwardly into mesh with the idlers 85, 88. Means for so shifting said pinions are fully described in my application No. 324,853, and include a shiftable frame having side plates 88 spanned by the arbor 81, on which the computing pinions rotate. Spacing said plates 88 apart are tie-rods 88 and 18. The arbor 81 may be secured by shouldered and headed screws 1| passing through the plates 88 to bind the latter against the ends of the arbor. The shiftable frame is guided for pinion meshing and unmeshing movements and is located laterally, by means of a pair of fixed plates 18 rising from a crossmember 14 that connects the front ends of the side members 55 of the framework. Between said fixed plates 18 the comb-guide 84 for the front ends of the pin-bars 88, 8| is supported. A tie-rod 15 spans the upper reaches of the fixed plates".

The dimculty of securing proper meshing of the computing pinions 45, 48 with the racks 82 and the idlers 85, 88 is overcome by the following arrangement, it being understood that said difllculty arises from the different pitch diameters of said pinions and from the requirement of moving the pinions in two directions that are substantially perpendicular to each other. The racks 82 for the twelve-tooth pinions 48 have their pitch-line offset downwardly from the pitch-line of the racks for the ten-tooth pinions 45. This offsetting of the pitch-lines of. the two sets of racks for the bars 88, 8| admits of downward movement of the pinions 45, 48, to mesh with said racks. To ment of the pinions 45, 48, the idlers 85 corresponding to the twelve-tooth pinions 46 are made smaller than the idlers 86 for the ten-tooth pinions 45, and, in order that said smaller idlers 35 may mesh with their respective racks, the pitchllnes of which are lower than the pitch-lines of the other racks, the center of rotation of the idlers 85 is offset from the center of rotation for the idlers 88. Means whereby the centers of rotation of the two kinds of idlers are offset from one another include a plate 18 dividing the space between the fixed plates 18. Said plate formed as seen in Figure 1 may have its lower end notched so that when said lower end is received in one of the slots of the comb-guide 84, it is articulated with the latter. The upper end of said plate 18 is similarly notched so as to be received in a groove 11 formed in the tie-rod 15. Between said plate 18 and the left-hand fixed has at the other end a shifting admit of a rearward moveplate 18, there is supported an arbor 18 which is secured to the plate 18 by a screw 18, and which trunnion received by the plate 18. On this arbor 18 the idlers 88 are arranged to rotate individually, being located laterally by suitable means, as, for example, hubs or collars 82. A similar arbor 83 serves for the idlers 85, and its axis is offset downwardly from the axis of the arbor 18. In order to form a fulcrum for the right-hand plate 88 of the pinion-shifting frame, a member 84 is secured to the right-hand fixed plate 18 by screws 88 and 88, the screw 88 passing through the fixed plate 18, and being threaded into a boss 81 of the member 84, said boss forming the aforesaid fulcrum. A. downwardly-extending arm supports one end of the arbor 88, the other end of the arbor having a trunnion received by the plate 18. The rotation of the member 84 is prevented by the screw 88, the end of. which is doweled into a rearwardly-extending'arm 88 of said member. The pinion-shifting frame-plates 88 have rearward extensions in which are formed slots 88, the slot in the left-hand plate embracing a collar 8| on the arbor 18, and the slot 88 of the right-hand plate 68 embracing, as seen in Figure 3, the boss 81 of the member 84 that serves to offset the arbor 88. The slots 88 of the plates 88 permit rearward and forward movement of the pinion-shifting frame, and said frame may also be swung downwardly and upwardly about the collar 8| and the boss 81. At its forward end the pinion-shifting frame is supported by an arm 82, which is rockable for lowering and raising the front end of the pinionframe to move the computing pinions into and out of mesh with the racks 82. Said arm 82 has a slot 88, which, in the normal position of the arm, stands horizontally, and-thus parallel with the slots 88 of the computingpinion-shifting frame. It will be seen that by means of said slots 88, 88, the frame is guided for rearward and forward shifting, which may be effected by any suitable means, as, for example, a pair of links 84 connected to the side plates 88. Means for selectively operating either the arm 82 to move the computing pinions down and up as for addition or the links 84 to move said pinions rearwardly and forwardly as for subtraction are fully set forth in my co-pending application No. 607,275, filed April 25, 1932 (now Patent No. 2,091,717 dated August 31, 1937). Other means which do not utilize the links 84 are set forth in my aforesaid application No. 324,353. The means whereby the arm 82 is rocked to lower the computing pinions, or whereby the pinionshifting frame is moved rearwardly, are controlled and driven by the general operator, to the end that there is a quick downward or rearward shifting of the computing pinions before the pin-bars 88, 8| are picked up and advanced by the cross-bar 53, and also to the end that said pinions are bar picks up the pin-bars in its return stroke.

For holding the several computing wheels while disengaged from the racks and idlers, each wheel may have a notched detent-disk 44 fastened' thereto and co-operating with a springpressed detent-lever 41 loosely mounted on the tie-rod 88, Figure 5. V

It will be seen that the extent to which each pin-bar 88 or 8| advances depends upon the digit value, that is, the location of the pin 28 which is depressed, it being evident that when the zero-pin is depressed, the pin-bar is not to be disengaged before said crossadvanced at all, except in a carry-over step in which said zero-pin co-operates, and that when the pin of highest digit value is depressed, the

pin-bar will be advanced to its maximum extent. As set forth in my application No. 324,353, and also in the application of Thieme, No. 563,033, filed September 16, 1931 (now Patent No. 2,075,557, dated March 30, 1937), all the zeropins are normally depressed, and if in any bar a pin or higher digit value is set, the zero-pin of that bar becomes automatically restored. Figure 5 illustrates the distance the cross-bar 53 must travel before the pin-engaging finger 63 picks up the highest digit-pin, namely, the ninepin. It is to be noted that the extent of advance of said cross-bar 53 is such that said finger 63 will just abut the zero-pin if that pin were de-- pressed. That is to say, the cross-bar 53 has just enough stroke to include the idle period that obtains before the highest digit-pin is picked up, and the extent necessary to advance the pin-bar nine spaces. The pence-bar 30, however, must be advanced eleven spaces by the advance of the cross-bar 53. Inasmuch as it is not feasible to reduce the idle period with reference to the pencebar at the beginning of the cross-bar advance, and which idle period affords the time for meshing the computing pinions, the following means are provided. In the space widely separating the pence-bar and the units-shillings bar, there is provided an elongate auxiliary member 91 shaped generally like the pin-bars 30, 3|, said auxiliary tion 98, the front edge of which normally stands somewhat behind the eleven-pin of the pencebar, as seen in Figure 9. A rearward extension 99 of said bar is received in the rear comb-guide 33 that serves to guide the pin-bars, said extension being longer than similar extensions of the pin-bars, because of the greater extent of movement of said auxiliary member 91, which must drive the pence-bar a maximum of twelve unitspaces. The pence-bar 30 has for the same reason a similarly lengthened rearward extension I00. The forward end of the bar 91 is received in the comb-guide 34 and is retained by a pin 95 projecting from the plate 16} Motion-multiplying means enabling the crossbar 53, while only advancing nine spaces after the above-described idle period, to advance the axuiliary member 91 eleven spaces, are provided, and will now be described. A lever IOI, having an upwardly-extending arm I02 and a downwardly-extending arm I03, rotates freely on the rod 66 on which the pin-engaging finger-levers 65 are mounted. The arms I02, I03 are spaced axially of said fulcrum-rod 66 and rigidly connected together by a hub I04, Figure 6, so that a gear-sector I05 formed on the uwardly-extending arm I02 is positioned adjacent the bar 91, and so that the downwardly-extending arm I 03 will be in line with a pin I 06 that forms part of the carry-over train from the fractional pence-wheel 43 to the pence-bar, and which train will presently be described. Fixed to the side of the bar 91 is a rack I01 meshing with the gear-sector I 05. The cross-bar 53 has a recess I08 clearing the pin-engaging projection 98 of the auxiliary member 91 and said sector I 05. The portion of the arm I02 forming the sector I05 includes an edge I09 normally. standing away from the bottom I I0 of the cross-bar recess I08 as in Figure 9. It will be seen now that as said cross-bar 53 is started of the recess I08. Further advance of the crossbar 53 will then cause the auxiliary member 91 to be carried along, since the lever IOI can rotate no farther in a clockwise direction. This idle advance of the cross-bar 53 plus the additional idle advance before the front edge of the pinengaging projection 98 of the auxiliary member 91 can pick up the highest digit pin of the pencebar constitutes the minimum idle period in the advance of said cross-bar, and, by suitable proportioning of the parts, said minimum idle period in respect to the pence-bar may at least equal the idle period that obtains for a pin-bar whose highest pin is the nine-pin. Thus there is afforded sufficient time for meshing the computing pinions before the pence-bar advances. The cross-bar itself has a range of movement which is effective to advance the pence-bar only nine spaces after the eleven-pin of the pence-bar is engaged. For advancing said pence-bar the necessary two extra spaces, the downwardly-extending arm I03 of the lever IOI is arranged to encounter the pin' I06 before the cross-bar 53 reaches the end of its advance stroke. Figure 10 indicates in broken lines how said arm I03 encounters the pin I06 before the cross-bar 53 is fully advanced. Figure 11 indicates how at the completion of the advance of the cross-bar, the lever I M has been rotated counterclockwise because its lower arm I03 has been arrested by the pin I 06. Said lever IOI in rotating will, by means of the auxiliary member 91, have caused the advance of the pence-bar to be extended two extra spaces beyond the advance which it receives from the cross-bar 53 alone.

Figure 9 represents the normal positions of the parts including the pence-bar, the general operator, and the auxiliary member 91, 98 and its coacting lever IOI. In said normal positions, the edge I 09 of the lever IOI stands away from the surface I I0 of the general operator, and therefore, at the beginning of the general-operator advance, the lever IOI can rock clockwise until said edge I 09 strikes said general-operator surface IIO. While the lever MI is thus rocking clockwise, its gear-segment I05 may roll idly along the rack I01 which is rigidly connected to the auxiliary member 91, 98, the latter standing still since it is restrained in part by its inertia and in part by whatever slight friction there is in the comb-guides 33, 34. This idle rocking of the lever IOI accompanied by idle movement of the general operator 53, serves the same purpose as having the pence-pin-engaging part 98 originally set farther back, relatively to the general operator, than in Figure 9, to provide a sufficiently long idle period at the beginning of the general-operator advance for meshing the computing pinions.

It may be that the auxiliary member 91, 90, instead of standing still right the general-operator advance, is at first carried along as by reason of slight frictional resistance at the bearings of the lever IOI preventing immediate idle rotation of said lever. But in such case, supposing it to happen, it will be seen that, as soon as the pence-pin-engaging portion 90 of the floating auxiliary member encounters a set pence-pin, say the 11 pence pin, further advance of said auxiliary member will be temporarily checked while the general operator 53 continues its advance, and the lever IOI consequently then effects its idle rotation, such checking of the auxiliary member and consequent idle rotation from the start of by the spring 48, Figure 5. In

. encompasses.

. passes only one transfer cycle.

of lever III being caused by the reaction aiforded by the pence-bar due to the restraintof the latter any case, whether the auxiliary member 81, 58 stands still right from the beginning of the. general-operator advance, or whether it first tends to advance, until checked by encountering say the 11" pin, before the lever IOI has completed itsidle rotation, it will be evident that just as the pence-bar is about to be advanced by means of the auxiliary member 81, 88 and the set "11" pence pin, the parts will be substantially in the position seen in Figure 10, where the lever has completed its idle clockwise rotation.

Continuing its stroke from the Figure 10 position, nine more unit-steps. Assuming now-that a 9" pin had been set in the pence-bar instead of the "11 pin, it will be evident from Figure 10 that the pence-pin-engaging edge of thev auxiliary member 31, 88 would be two steps away from the "9 pin, and therefore would be two steps .short of advancing the pence-bar, through the 9" pin, its requisite nine spaces if the relative positions of said auxiliary member operator 53 remained the same as in Figure 10 at the end of the forward stroke of the general operator.

But, since the auxiliary member does advance two steps relatively to the general operator during the advance of the latter from the Figure 10 position, and thereby only makes up the two steps it would have been short, as just described, of advancing the pence-bar its requisite nine steps, it will be evident that the pence-bar will be advanced nine steps, and not eleven steps. Similarly, if the 8 pence pin were set, the pencebar would be advanced eight steps, and not .ten steps, or if the 6" pence pin were set, the pencebar would be advanced six stepsyand not eight steps, and so on, for the setting of any other pin of the pence-bar.

As already stated, there is provided for each of the pin-bars 30, 3| a lever 55 forming the finger 83 whereby the pin-bars may be advanced an extra unit-space for carrying, said extra space being in addition to the advance of the pin-bars afl'orded by the range of advance of the crossbar 53. In order that a dial-wheel may institute a carrying advance of the rack for the dial-wheel of next higher denomination, it is provided with carrying teeth H2, the number of carrying teeth on each wheel depending on the number of transfer cycles which a full revolution of the wheel The fractional pence-dial wheel 43 encompases three such cycles, as already stated, and, therefore, has three carrying teeth H2, as indicated in Figure 4. The double dial 4 I, 42 which constitutes the pence-wheel has only one carrying tooth I I2, said tooth being herein shown as mounted on the dial 42, although it might just as well have been mounted on the dial H. The units-shillings wheel 40 has only one tooth H2 since a full revolution thereof encom- Inasmuch as every other step'of the tens-shillings wheel requires a transfer of one to the units-pounds dial 38, said tens-shillings dial-wheel 39 has five carrying teeth H2, evenly spaced around its circumference. Each of the pounds-wheels 38 has only one carrying tooth H2. The teeth on the several dial-wheels are so positioned that as each wheel takes the step which completes a transfer cycle, and thus requiring a transfer of one to the wheel of next higher denomination, it passes over the general operator 53 can advance only 91, 38 and the general.

the cam-shaped arm H8 ofa-lever H4 to rock said lever and. by means of another arm H8, raise the forwardend of an elongate latchcl I5.

Pivoted to the rearward end of the latch H5 is an upstanding arm I ll of a lever H8 on a stationary fulcrum-rod H0. Said lever has a downwardly and rearwardly extending arm I carrying the aforesaid pin I06. The rear end of the elongate latch I II is thus supported by (its pivotal connection I2I to the lever I II. The forward end.

- of the elongate latch III is slidably supported in comb-guide 34 for the pin-bars.

.a slot-I22 of t 30, 3i. The forward end of the latch H5 has two branchesabove and below-said combde 34, an upper branch I-23 being received in the slot I22, Figures 9 and 11,-0f said guide and a lower branch I24 contacting with the arm H6 of the carrying lever I I4. The latch H5 isurged forwardly by a spring I28, one end of said spring being attached to the latchand the other end being attached to the anchor-plate I21 mounted on the under side ofa transverse latch-bar I28 v which serves to restrain said latch I I5from mov ing under the pull of its spring I28. In order that said latch H5 may be so restrained, it is formed with a latch-edge I30, Figure '7. As seen in Figures 5, 9 and ii, said edge is normally caught over the bar I28. v

From every dial-wheel from which a carryover transfer of one to the next higher dialwheel has to be effected, there extends a train of the parts just described, namely, the carryover lever H4, the latch H5, and the stationary lever H8, the pin I08 of saidstationary lever being opposite the lever 85 for the pin-bar of the dial-wheel of next higher denomination. of the levers 85 has a downwardly-extending arm I32 which at the end of the advance stroke of the cross-bar 53 Just abuts the pin I08 when no extra carrying advance of the pin-bar is to-be effected. Also when no such carrying advance is to be effected. the finger-53 of the lever 65 abuts the front face of, the cross-bar 53 andat the same time abuts the depressed pin of the pin-bar advanced by it. Also abutting said depressed pin, but at the forward face thereof, is a stop I33 formed on the rear end of the latch H5. Thus, at the end of the advance of the cross-bar 53, with the depressed pin 28 confined between the stop I33 and the finger 53, the latter abutting the. bar 53-and with the downwardlyextending arms I20, I32 of the levers H8 and 55 respectively also abutting one another, the pin-bar is guarded against overthrow or rebound as it reaches the end of its advance stroke. Normally the rear edge of the overthrow-preventing stop I33 stands fowardly of the normally depressed zero pin, as in Figures 5 and 9, in order that the pin-bar may be slightly advanced to pin-setting position. During the forward stroke of the cross-bar 53, however, the latch H5, together with its latch-bar I28, is moved rearwardly until the rear edge of the stop I33 is in vertical alignment with the front face of the zeropin of the normally pomtioned pin-bar, it being evident that when the stop I33 is so positioned, any set index-pin will be just brought up to it if the pin-bar is advanced. As the latch-bar I28 with the latches H5 caught thereover is moved rearwardly, the upper arms H! of the stationary levers H8. will move rearwardly and away from a stationary stop-rod I35, as indicated in Figure 11, it being noted, however, that said Figure 11 represents the downwardly-extending arm I03 of the lever III instead of the downwardly-extend- Each ing arm I32 of the lever 65. Of this, further explanation will be made later on. As set forth in my application No. 324,353,.the latch-bar I28 may be slidably supported between the stationary plates 13, for rearward and forward movement. Said latch-bar I26 is coupled to the general-operator mechanism so that during the cycle of the latter, it may be moved at the proper time. There extends accordingly across the machine a rock-shaft I36 which may be journaled in the side members 55 of the framework. A cam I31, fastened to the general-operator cross-shaft 51, co-operates with a double-armed follower I38, fastened to said rock-shaft I36, said cam oscillating to and fro once during a cycle of the general operator, and thereby rotating the rock-shaft I36 in one direction during the forward stroke of the general operator and in reverse direction during the rearward stroke of said general operator. Also fastened to said rocks-shaft I36 is a pair of arms I39, Figures 6, 9 and 11, connected by links I40 to the ends of the latch-bar I28. Figure 11 indicates the rock-shaft I36 as having been rocked clockwise during the advance stroke of the general operator and as having, by means of the arms I39 and the links I40, moved the latch-bar rearwardly. It will be evident that if, in the forward stroke of the general operator accompanied by rotation of the dialwheel, any carrying tooth II2 has passed over the cam-arm II3 of the carrying lever II4, the forward end of the latch II5 will have been raised to result in forward movement of the latch under the pull of the spring I26 as said latch escapes from the latch-bar I28. It will also be evident that the stationary lever II8 will have been thereby rotated counterclockwise until stopped by the rod I35, and that its pin I06 will I have been moved rearwardly. With said pin I06 thus moved rearwardly, the arm I32 of the lever 65, instead of just abutting said pin I06 at the end of the forward stroke of the cross-bar 53, will, as the cross-bar completes said forward stroke, swing rearwardly, accompanied by forward movement of pin-engaging finger '63 equivalent to a unit-space of pin-bar movement. In this manner a pin-bar receives an extra carrying advance of one unit-space whenever the corresponding latch-bar H5 is tripped by the dialwheel of the next lower denomination.

It is a feature of this invention that the lever IOI on the cross-bar 53, and by means of which the pence-bar is advanced two extra spaces, also serves as a carry-over lever, that is, it is made to serve in the same capacity as does any one of the levers 65, it being noted that no lever 65 is provided for the pence-bar. In order that the downwardly-extending arm I03 of said lever IOI may co-operate with the pin I06 for advancing the pence-bar two additional spaces and also one extra space for carrying, it has an edge I43 formed as best seen in Figures 10 and 11. In swinging from the position seen in Figure 10, when said edge first contacts with the pin I06, as indicated by the broken lines, to the position of said edge indicated in Figure 11, there is a transition of the pin I06 along said edge. Figure 11 shows the latch I I5 still caught over latchbar I28 and therefore, by means of the lever IN and auxiliary member 91 connected thereto, the pence-bar will only have been advanced two unit-spaces in addition to the advance effected by the advance of .the cross-bar itself.

Figure 7 indicates the latch II5 corresponding to the pence-bar as having been tripped by the farthings-dial wheel 43. Consequently the interponent-pin I06 of the stationary lever H8 is displaced rearwardly, causing further rotation of the lever IN and further advance'of the auxiliary member 97, resulting in one extra unit-space of pence-bar advance in addition to the two extra unit-spaces of pence-bar advance which are always effected irrespective of whether or not the pence-bar is carried". A scooped-out portion I3I of the edge I43 coincides with the pin I06 and is formed to direct the reaction of the tendarmy of the parts to rebound, through the tulcrum of the lever II8. In the return stroke of the general operator, the latch-bar I28 is moved forwardly again, thereby causing all the latch members I I 5 which were not tripped to be moved forwardly and incidentally causing the relatching of the latch-members II5 that were tripped. In this forward position, the latch-bar I28 stands at the end of the computing cycle, so that all the overthrow-preventing stops I33 stand in order to permit the slight advance of the rackbars 30, 3| for pin-setting, forwardly of the zeropins 29 as in Figure 9.

It will be seen now that the stop I33 for the pence-rack bar is automatically adjusted in accordance with the differential extra advances of said pence-rack bar 30. That is, when the pin I06, through its normal condition in the cycle, effects operation of the lever IOI and companion auxiliary member 91 for the normal extra advance of two steps of the pence-rack bar, the pence-rack-bar stop I33 will automatically have been adjusted to limit the pence-rack bar to such normal extra advance, as in Figure 11; and when the pin I06 has been adjusted to a carry-over condition, Figure 7, to eifect a carry-over increase of said extra advance, the same pence-rack-bar stop I33 will have been automatically adjusted to limit said increase of extra advance.

As set forth in my application No. 324,353, a universal bail (not shown) is operated during the return stroke of the general operator to engage all the zero-pins and effect resetting of all that had been restored through the setting of higher pins. Thus said higher pins, by resetting of the zero-pins, are themselves restored and the pinbars are then ready to receive the indexing of another item. The restoration of the pins takes place near the end of the stroke of the general operator, it being understood that said general operator in its return stroke picks up and returns the pin-bars by engaging lugs I45 thereon. All the lugs I45 with the exception of the lug of the pence-bar are directly engaged by the rear face of the general operator. The lug I45 of the pence-bar is engaged by the rearward edge of the projection 98 that extends laterally from the auxiliary member 91. It will also be understood that before the general operator picks up any of the pin-bars by engaging their lugs I 45, there is at the beginning of the rearward stroke, an idle period which affords time for unmeshing the computing pinions 45, 46 either from the racks 32 or from the idlers 35, 36.

Figure 6 shows how the forward and rearward reaches of the latches II5 are offset from one another so that the forward reach may overlie the carrying lever H4 and so that the rearward reach may be connected to the stationary lever IIB for the pin-bar that is of next higher denomination to the wheel which actuates said carrying lever II4. Figure 6 also shows that said offset of the reaches of the latch II 5 controlled by the pence-wheel is greater than the offset for 7 the other latches, this being so because the corresponding lever H4 is in line with the unitspence wheel 42 while the units-shillings rack to which the transfer is made is farther spaced than is usual for the spacing between the racks, on account of the interposition of the tens of pence dial-wheel. ll.

The several stationary levers Ill mounted on the common fulcrum-rod I II are spaced apart by suitable hubs or collars I. Said fulcrum-rod H and the stop-rod I35 may be supported be-' tween rearward extensions ill of the fixed plates II.

As the general operator nears the end of its return stroke an edge I of the downwardlyextending arm III of the pence-bar lever llll encounters the'forward end of a stop H1 secured to the bottom of a cross-member I" forming part of the framework. Thus, as the general operator reaches the end of its return stroke, said lever llll will have been rotated to the position seen in Figure 9, which indicates the normal positions of the parts. The general operator does not of itself return the pin-bars 3|, ii to their fully retracted positions, the completion of the return of the pin-bars being efiected by the spring-devices 48; that is to say, just as the cross-bar 53 reaches the end of its return stroke, the ends of the-spring-devices 48 will snap over the corners ll! of the pin-bars and thereby force them rearwardly until they abut the combguide 33.

When writing fractional pence or farthings, the upper-case types are used, as indicated in Figure 8, which shows that the numeral-keys l, 2", 3" are also used when writing the uppercase figures 9%" and to represent fractional pence. The arrangement of the means called into action when writing said upper-case figures for fractional pence may be along the lines of the aforesaid Gumprecht patent. In said patent, the left-hand case-shift key is designated as a farthings-key. In the Underwood bookkeeping machine, the denominational pin-bar-selecting mechanism is usually silenced when uppercase characters are to be printed. When the right-hand case-shift key is pressed, this condition still obtains, through the use of suitable means as set forth in the Gumprecht patent. Said patent also shows an arrangement whereby operation of the left-hand case-shift key, that is, the farthings-key, is ineflective to call into action the means for suppressing the denominational selection of the pin-bars. Hence, when writing the upper-case fractional pence-figures V4, and /4 in a computing zone, the farthings-key is held down and the pin-setting bars 21 will be operated. It will be understood that a so-called 46-irey typewriting machine may be used in which the twelve numeral-keys indicated in Figure 8 may be readily incorporated in the numeral-key row.

It will be noted that the organization herein shown for computing in the sterling system is very simple. The carry-over trains operate in the same manner for subtraction'as they do for addition. The only difference in the operation of the machine in respect to an additive computation and a subtractive computation is that in the former the computing pinions are meshed directly with the racks 32 for rotation in clockwise direction, while for subtraction said pinions are meshed with the idler: II. I. for rotation in the opposite direction. In either case the carry-over levers III are eflective to operate the carry-over trains as set forth in my aforesaid applications. It will be noted that from the pound-wheel ll of highest denomination there extends'no carryover train, it being evident that no transfer is required to be made from said pounds-wheel.

In order that the fractional pence-bar may be controlled against overthrow and rebound, there may be provided for said pence-bar one of the levers 65 and also a stationary lever H8 and a latch H5, it being noted, however, that said latter latch H is never tripped and that no carryover lever I ll needs to be provided therefor.

Variations may be resorted to within the scope of the invention, and portions of the improvements may be used without others.

Having thus described my invention, I claim:

1. In a sterling computing machine having d al-actuating rack-bars, the combination with a pence-rack bar having settable digit-pins, said pence-rack bar movable eleven unit-spaces and a reciprocatory general operator having an advancestroke capable of moving said rack-bars a maximum of nine unit-spaces, of,a lever on said general operator, means operatively connected to said lever to engage a set pin of said pence-bar, so that said pence-bar may be advanced by said general operator, and means efiective to rock said lever during the advance of the general operator, and thereby move said pence-bar two extra unitvspaces.

2. In a sterling computing machine, the combination with a pence-wheel, a rack for rotating the pence-wheel, said rack having settable indexpins, and means mounting said rack for wheeladvancing movement, of a reciprocatory general operator having a range of rack-advancing movement of nine unit spaces, a lever on said general operator, an auxiliary member mounted for movement alongside of said pence-rack, and having a lateral projection for engaging the set pin of the pence-rack, said auxiliary member also having rack-teeth, one arm of said lever forming a gear-sector meshing with the rack-teeth of the auxiliary member, and means adapted to co-operate with a corresponding arm of the generaloperator lever and rock the latter as said general operator reaches the end of its advance movement, thereby causing said auxiliary memher and said pence-rack to be advanced two unit spaces beyond the general operator.

3. In a sterling computing machine, the combination with a pence-computing-wheel rack having selectively settable index pins ranging in value up to eleven, of a reciprocatory general operator having a range of rack-advancing movement of nine spaces, a lever on said general op erator, means operatively connected to one arm of said lever to reciprocate with said general operator to engage the set pin of said pence-rack, means positioned to engage another arm of said lever during the general-operator advance and rock said lever, thereby normally advancing the pence-rack two unit spaces beyond the range of the general-operator advance, and a stop positioned to engage said other arm of the generaloperator lever as said general operator reaches the end of its return strok thereby restoring said general-operator lever to normal position relative, to the general operator.

4. The combination of a reciprocatory computing wheel drive-rack having digit-pins settable to determine the extent of movement of said rack, a reciprocatory general operator for said rack having an effective range of rack-actuating advance less than the determined movement of. said rack, a device movable along with said general operator, and also relatively thereto, for engaging the set digit-pin, and means causing said pin-engaging device to be given extra movement during the advance of the general operator.

5. The combination of a computing wheel. a reciprocatory rack having selectively settable digit-pins from 1 to 11, said rack and wheel being normally disconnected and being connectible preparatory to moving the rack to turn the computing wheel an amount corresponding to the digit-pin set, a reciprocatory general operator, digit-pin-engaging means movable along with said general operator, and also relatively thereto, said digit-pin-engaging means having a lostmotion connection to said general operator so as to be ineffective at the initial part of the generaloperator advance before co-operating in advancing the rack, to thereby aflord time for connecting said rack and wheel during the general operator cycle, the remainder of the general-operator advance being less than the movement of said rack, and means acting during said remainder 0! the general-operator advance to give said movable digit-pin-engaging means extra movement to thereby complete the requisite rack movement.

6. A sterling computing machine including, in

combination, a pence totalizer wheel, a driving rack therefor having key-settable index-pins from 1 to "11", a reciprocatory general operator having a stroke comprising an initial idle advance movement and a remaining rack-driving advance movement of nine unit-steps, said wheel being normally disengaged from said rack and being engageable therewith during said idle initial movement, a supplemental driver adapted to engage a key-set pence index-pin for driving the pence-rack, said supplemental driver being operatively connected to said general operator so as to be substantially stationary during said initial movement and then be driven by said general operator during the nine-step advance of the latter, and means automatically causing said supplemental driver to be advanced relatively to said general operator during said nine-step movement of the latter, whereby to amplify the stroke of said driver to make it suflicient for advancing the pence-rack l1 unit-steps.

HENRY- L. PITMAN. 

